Skip Tokamax RaggedDotGroupSizes for FP8

[BirdsOfAFthr]

Description

FP8 path is still using tokamax internal backend APIs. The new RaggedDotGroupSizes was introduced (pull3330) for Tokamax public APIs in bf16 path, which broke FP8.

Tests

Benchmarks were run internally.

Checklist

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[shuningjin]

LGTM. This aligns with my experiments.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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